A couple years ago my 2 daughters went to Canada. I can only remember the year and the month, and I think that they were there for about 1 wk or maybe a day or two less. My problem is that I cannot remember the exact number of days that they left and returned to the U.S. If I write down my best estimate on the form, will my daughters' application get rejected? Is there any way for me to find out the exact time frame? Please help!